ISHS Acta Horticulturae 278: Symposium on Scheduling of Irrigation for Vegetable Crops under Field Condition
EVALUATION OF A FLOATING EVAPOTRANSPIROMETER OPERATING IN FIELD CONDITIONS |
| Authors: | M.E. Venezian Scarascia, N. Losavio, M. Mastrorilli, G. Rana, P. Dello Russo |
| Abstract:
A relatively simple and inexpensive lysimeter has been designed to evaluate crop water use under field conditions. This equipment has been expressly planned to be movable and to provide the integration of daily evapotranspirative flux with a 0.025 mm sensitivity. The hydrostatic pressure of floatation liquid (Archimede's principle) changes with the weighing variations of the soil-crop vegetation system. Pressure changes are recorded by an electronic piezometer connected with the floatation liquid. Calibration of the lysimeter was accomplished after it was installed in an experimental field in Southern Italy in order to mesure weight variations up to 150 kg corresponding to the weight of the maximum amount of water held by the soil. Wheat crop evapotranspiration as measured by the floating evapotranspirometer was compared with class A pan evaporation, soil water balance and ETr as measured by the weighing lysimeter on a nearby reference crop (ryegrass). | |
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